摘要:
目的 探索肿瘤血管内皮生长因子(VEGF)受体(VEGFR)在人类肿瘤细胞的表现特征.方法 将123 I-VEGF165和123 I-VEGF121标记于人脐静脉内皮细胞(HUVEC)、人类肿瘤细胞株(HMC-1、A431、KU812、U937、HEP-1、HEP-G2、HEP-3B、Raji)、多种人体肿瘤及邻近的非瘤组织和外周血液细胞.统计特异性结合位点最大结合容量(Bmax)值、解离常数(Kd)以及放射性同位素的50%特异性结合所需浓度(IC50)数值.判断各种细胞与123I-VEGF165和123I-VEGF121结合亲和力、数量、特异性.结果 在HUVEC表面发现两种123I-VEGF165结合位点,而123I-VEGF121是单类结合位点.123I-VEGF121位于特定细胞株(HUVEC、HEP-1、HMC-1)和特殊的早期肿瘤(早期黑色素瘤、乳腺导管内癌、卵巢癌和脑膜瘤)中.与外周血液细胞和非瘤组织相比,肿瘤细胞的VEGFR数量明显较多.在123I-VEGF165标记的VEGFR中,早期黑色素瘤、乳腺导管内癌、肝细胞癌、乳头状甲状腺癌、卵巢癌、肾细胞癌的Bmax值分别为45±13、13±3、25 ±8、5±2、42±12、20 ±6.而在123I-VEGF121标志的VEGFR中,早期黑色素瘤、乳腺导管内癌、卵巢癌的Bmax值分别为30 ±8、8±3、20 ±6.123I-VEGF165和123I-VEGF121与诸多人体肿瘤细胞或组织具有特异性结合能力.与123I-VEGF121相比,123I-VEGF165可与更多不同种类的肿瘤细胞相结合,且容量大.结论 123I-VEGF165可能是肿瘤体内成像的一个潜在有效靶点,有望用于肿瘤的诊断与治疗.%Objective To explore the expression characteristics of vascular endothelial growth factor (VEGF) receptor (VEGFR).Methods The 123I-VEGF165 and 123I-VEGF121 were marked to human umbilical vein endothelial cell (HUVEC),several human tumor cell lines (HMC-1,A431,KU812,U937,HEP-1,HEP-G2,HEP-3B and Raji),a variety of human tumors and adjacent non-neoplastic tissues as well as peripheral blood cells.Then,the specific binding site maximal binding capacity (Bmax),dissociation constant (Kd) and concentration of 50% required specific binding (IC5o) were analyzed.The affinity,quantity and specificity of different cells combined with 123I-VEGF165 and 123I-VEGF121 were judged.Results Two kinds of analogous 123I-VEGF165 binding sites on the surface of HUVEC were found.While,there was only one kind of 123I-VEGF121binding site.123I-VEGF121 was found on the special cell lines (HUVEC,HEP-1 and HMC-1) and special early tumors (early melanoma,ductal breast cancer,ovarian cancer and meningioma).Compared with peripheral blood cells and adjacent non-neoplastic tissues,the number of VEGFR of tumor cells was bigger.Among the 123I-VEGF165 marked VEGFR,the Bmax value of early melanoma,ductal breast cancer,hepatocellular carcinoma,papillary thyroid carcinoma,ovarian carcinoma,renal cell carcinoma were 45 ± 13,13 ± 3,25 ±8,5 ±2,42 ± 12,20 ±6,respectively.While among the 123I-VEGF121 marked VEGFR,the Bmax value of early melanoma,ductal breast cancer,ovarian carcinoma were 30 ± 8,8 ± 3,20 ± 6.123I-VEGF165 and 123I-VEGF121 had specific binding capacity with a variety of human tumor cells and tissues.Compared with 123I-VEGF121,there were more different kinds of tumor cells could be bound to 123I-VEGF165 with higher capacity.Conclusion 123I-VEGF165 may be a potential target of tumor imaging in vivo,and it is expected to be used to diagnose and treat tumors.